using vector of vectors in plug-in algorithms

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I am in trouble while using vectors in plug-in algorithms.

I created a model class with a vector of vectors.

I provided access to DMHALLOC in that class and I succeded making room for the vector, but when I tried providing room for the vectors of the vector (using resize) I got an unexpected error. I tried to debug into the code without success.
It would be helpful if anyone provide me a sample code.

Thank you

Claudio
.